This issue depend on your products, if you are producing technical ceramics and refractory materials,usually no need empty firing. But for electronics fields will be needed, like: ITO target, semi-conductor and high request on surfaces.By empty-firing rsic plates and beams, 1 or 2 times firing would help exist impurities for higher kiln furniture’s purity,  Additionally Tangshan Sndou can do grinding service, thus you can get 0.05mm tolerance and very smoothly surfaces and perfect linearity,then avoid pollution & improve your products.

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